linux-kernel - Re: [PATCH] bootconfig: Fix CONFIG_BOOTTIME

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Date:   Thu, 27 Feb 2020 10:18:08 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bootconfig: Fix CONFIG_BOOTTIME_TRACING dependency issue

Hi Hiramatsu-san,

On Tue, Feb 25, 2020 at 4:47 PM Masami Hiramatsu <mhiramat@...nel.org> wrote:
> Since commit d8a953ddde5e ("bootconfig: Set CONFIG_BOOT_CONFIG=n by
> default") also changed the CONFIG_BOOTTIME_TRACING to select
> CONFIG_BOOT_CONFIG to show the boot-time tracing on the menu,
> it introduced wrong dependencies with BLK_DEV_INITRD as below.
>
> WARNING: unmet direct dependencies detected for BOOT_CONFIG
>   Depends on [n]: BLK_DEV_INITRD [=n]
>   Selected by [y]:
>   - BOOTTIME_TRACING [=y] && TRACING_SUPPORT [=y] && FTRACE [=y] && TRACING [=y]
>
> This makes the CONFIG_BOOT_CONFIG selects CONFIG_BLK_DEV_INITRD to
> fix this error and make CONFIG_BOOTTIME_TRACING=n by default, so
> that both boot-time tracing and boot configuration off but those
> appear on the menu list.
>
> Fixes: d8a953ddde5e ("bootconfig: Set CONFIG_BOOT_CONFIG=n by default")
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  init/Kconfig         |    2 +-
>  kernel/trace/Kconfig |    1 -
>  2 files changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/init/Kconfig b/init/Kconfig
> index a84e7aa89a29..8b4c3e8c05ea 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1217,7 +1217,7 @@ endif
>
>  config BOOT_CONFIG
>         bool "Boot config support"
> -       depends on BLK_DEV_INITRD
> +       select BLK_DEV_INITRD
>         help
>           Extra boot config allows system admin to pass a config file as
>           complemental extension of kernel cmdline when booting.
> diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
> index 795c3e02d3f1..402eef84c859 100644
> --- a/kernel/trace/Kconfig
> +++ b/kernel/trace/Kconfig
> @@ -145,7 +145,6 @@ config BOOTTIME_TRACING
>         bool "Boot-time Tracing support"
>         depends on TRACING

Why not "depends on BLK_DEV_INITRD?" here?

/me tries to contain the bloat introduced by the bootconfig stuff.

>         select BOOT_CONFIG
> -       default y
>         help
>           Enable developer to setup ftrace subsystem via supplemental
>           kernel cmdline at boot time for debugging (tracing) driver

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds